LimeWire

LimeWire was a free peer-to-peer file sharing client for Windows, macOS, Linux and Solaris. Created by Mark Gorton in 2000, it was most prominently a tool used for the download and distribution of pirated materials, particularly pirated music. In 2007, LimeWire was estimated to be installed on over one-third of all computers globally.

Both a zero-cost version and a purchasable "enhanced" version called LimeWire Pro were available; however, LimeWire Pro could be acquired for free through the standard LimeWire software, where users distributed it without authorization. LimeWire uses the gnutella network as well as the BitTorrent protocol.

On October 26, 2010, U.S. federal court judge Kimba Wood issued an injunction ordering Lime Wire LLC to prevent "the searching, downloading, uploading, file trading and/or file distribution functionality, and/or all functionality" of its software in Arista Records LLC v. Lime Group LLC. A trial investigating the damages necessary to compensate the affected record labels was scheduled to begin in January 2011. As a result of the injunction, the RIAA initially suggested that LimeWire was responsible for $72 trillion in damages, before eventually settling for $105 million. Thereafter, the company stopped distributing the LimeWire software, and versions 5.5.11 and newer have been disabled using a backdoor installed by the company. However, version 5.5.10 and all prior versions of LimeWire remain fully functional and cannot be disabled unless a user upgrades to one of the newer versions.